Acquisition of a Digital Imaging System for Advanced Transmission Electron Microscopy of Nanostructured Materials

0076504Liu这是内布拉斯加大学林肯分校获得的透射电子显微镜（TEM）数字成像系统的奖项。该仪器将安装在现有的JEOL 2010 TEM上，以开发两种新技术，超分辨率TEM（SRTEM）和选择反射成像（SRI）。这将使我们有可能发展一个简单而有效的模型，通过后期图像处理来扩展TEM显微图像的分辨率。第一种方法只涉及傅里叶变换和图像求和。用这种方法，用这种方法常规地获得具有0.15纳米分辨率的图像。第二种技术包括用于纳米结构材料表征的选择性反射成像。 这种技术使用电子衍射图案中的单个环来形成图像。 一个小孔径和照明倾斜是用来实现在传统的TEM实验设置。 用常规JEOL 2010透射电镜进行的初步研究表明，该技术具有操作简单、结果快速的优点。 这项拨款将用以资助购置一套数码成像系统，这套先进的系统在分辨率、记录图像和分析图像的能力等方面，均较现有设施有极大的改善。 该仪器最适合于小型纳米技术规模的研究。

0076504LiuThis is an award to the University of Nebraska-Lincoln for the acquisition of a digital imaging system for Transmission electron microscopy (TEM). The instrument will be fitted on an existing JEOL 2010 TEM to develop two new techniques, super-resolution TEM, (SRTEM) and selected reflection imaging (SRI). This will make it possible to develop a simple but an effective model to extend the resolution of TEM micrograph through post image processing. The first method only involves Fourier transform and image summation. With this method, images with 0.15 nanometer resolution are routinely obtained with this method. The second technique consists in selected reflection imaging for nanostructured materials characterization. This technique uses a single ring in the electron diffraction pattern to form the image. A small aperture and illumination tilting are used to achieve the experimental set-up in a conventional TEM. Preliminary results obtained using conventional JEOL 2010 TEM indicate that this technique has the advantage of easy operation, and instant results. Measurement of nano-particle size, phase identification and volume fraction measurement in dual phase materials will be possible.This grant is to support acquisition of a digital imaging system, a sophisticated system which will be a tremendous improvement in terms of resolution, as well as ability to record the images and later analyze them, over the current facilities. The instrument is best suited for research at the small nanotechnology scale.